Explanation:
Fix your camera to a tripod and you can record the graceful
trails
traced by the stars as planet Earth
rotates on its axis.
For example, this dramatic 5 hour long exposure was
made on February 24 from
Haute-Provence Observatory (OHP)
in southeastern France.
Actually a composite of 300 consecutive 1-minute exposures, the image
nicely shows stars near the celestial equator tracing nearly straight
lines in projection, while stars north and
south of the equator,
respectively, appear to
circle the north and south
celestial
poles.
Domes at the bottom left and right house the OHP telescopes.
Brilliant planet Venus makes the short
bright trail at the lower right, while
trails of stars in the constellation Orion
end near the lower right observatory dome.
Sirius,
alpha star of Canis Major, traces the bright arc over the dome at
the left.
Astronomer Alexandre Santerne also briefly illuminated a foreground
oak tree during the exposure sequence.